Pyright

Enhancement: Exposed WindowError from builtins.pyi file.

Enhancement: Added overload definitions for built-in "open" function so it distinguishes between Io[str] and Io[bytes] if the provided mode argument is a string literal.

Bug Fix: Added support for metaclasses when using magic function lookups. This allows classes, for example, to be used in binary operation expressions.

Bug Fix: Fixed recent regression in "Organize Imports" feature that caused incorrect ordering of imports.

Bug Fix: Fixed issue that caused sporadic type checker errors to be reported when editing or opening certain files within a workspace.

New Feature: Added support for Python 3.8 "position-only parameters".

Bug Fix: Enum classes are now properly treated as iterable types.

Bug Fix: Fixed several bugs in typestub generation feature, some of which resulted in crashes or out-of-memory errors.

Enhancement: Changed TypeVar matching to perform type expansion. Removed hack __init__ overload for dict class that was required because we weren't performing type expansion.

Enhancement: Used aggressive bundling and minification to reduce the VS Code download size by over 50%. Shaved 200ms (80%) off its startup time.

Bug Fix: Fixed a case where a Union type alias (e.g. A = Union[T, B[T]]) was not being handled properly.

Bug Fix: Fixed issue where non-type-stub files were imported and analyzed if they were within a directory with an __init__.pyi file.

Bug Fix: Added code to suppress all analysis and errors of third-party code files.

Bug Fix: Fixed issue where certain types that were already specialized were re-specialized, overwriting the previous type arguments.

New Feature: Added config switch for reportUnknownLambdaType.

Enhancement: Implemented parameter type inference for lambdas (uses bidirectional type inference where possible).

Enhancement: Extended bidirectional type inference for types that are nested within dictionaries and tuples.

Enhancement: Implemented two-pass argument for parameters that require type variable matching. This allows for better type checking of arguments and provides better compliance with PEP 484 standard.

Enhancement: Improved type completion within lambda expressions.

Bug Fix: Fixed bug that caused type checker to mistakenly analyze third-party source files that are imported by third-party stub files. The analyzer now stops when it encounters a third-party source file, even if it's included by a stub file.

Bug Fix: Fixed bug that caused some unioned types to be dropped because the deduping logic was mistakenly detecting duplicates.

Bug Fix: Fixed handling of augmented expressions that are defined by the special "i" forms of operator magic methods.

Bug Fix: Fixed handling of tuple expressions that contain unpack operations.

Bug Fix: Fixed regression introduced in previous release relating to yield statements with no expression.

New Feature: Added support for Python 3.8 ability to use unpack operators within return or yield statements.

New Feature: Added support for Python 3.8 f-string expressions that end in "=".

Bug Fix: Reduced size of pyright extension by 70%+ by deleting large "LSIF" files that have started to be included in some of the dependent modules.

Bug Fix: Fixed analysis of the second (optional) parameter of assert statements.

Bug Fix: Fixed issue that caused Callable type not to be assignable to generic Type[_T] parameter.

Bug Fix: Fixed bug where unpack operation was not allowed in right-hand side of simple assignments.